Vacuum cleaner filter bag



Jan. 27, 1970 .1. J. Fr-:sco 3,491,522

VACUUMVCLENER FILTER BAG Filed May 22. 1967 2 sheets-sheet 1 F/@z/ pw Fm@ 2 MV" /dm Jan. 27, 1970 J. J. FEscQ VACUUM CLEANER FILTER BAG 2 Sheets-Sheet 2 Filed May 22, 1967 INVENTOR. L//m/ J. Fifa@ United States Patent O 3,491,522 j VACUUM CLEANER FILTER BAG John J. Fesco, Baldwin, N.Y., assignor to Studley Paper Company, Inc., Far Rockaway, N.Y., a corporation of New York Continuation-impart of application Ser. No. 492,756, ct. 4, 1965. This application May 22, 1967, Ser. No. 640,001

' Int. Cl. B01d 29/10, 29/00 U.S. Cl. 55-376 1 Claim ABSTRACT OF THE DISCLOSURE RELATIONSHIP WITH PRIOR APPLICATIONS This application is a continuation-in-part of my copending application Ser. No. 492,756, filed Oct. 4, 1965, now Patent No. 3,350,859 entitled Vacuum Cleaner Filter Bag.

BACKGROUND OF THE INVENTION Field of the invention This -invention resides in the -vacuum cleaner filter bag art and more particularly to that portion directed to bags useful for upright type vacuum cleaners. This invention relates especially to bags designed to eliminate the problems attendant with use of the prior art bags.

Discussion of the prior art e In;my copending application, I disclose a new and improvedvacuum cleaner fil-ter bag having a receptacle anda connecting tube in which the receptacle is formed of'a single sheet of porous or air pervious paper folded substantially in half along a fold line and adhesively joined along mating edges extending from the fold line to defiine a receptacle structure having a top defined by a pair of juxtaposed edges of the sheet opposite the fold line. There is provided a pair of faces having sides defined byl the joined edges and a seamless bottom defined by -the fold line, and the receptacle is pleated to provide a plurality of knife pleats adjacent each of the sides, each of the knife pleats extending down one face of the receptacle under the bottom and up the opposed face of the receptacle. One of the faces is perforated to define an aperture therein in registry with an aperture on a connecting tube afiixed thereto. The connecting tube is constructed as an elongated tube of air impervious paper having an open lower end adapted to embrace the vacuum cleaner discharge fitting and an upper end adjacent the top of the receptacle. The connecting tube is perforated to define the aforesaid aperture and is joined to the receptacle by a layer of adhesive interposed between the connecting tube and receptacle and surrounding the registered apertures. The upper end of the tube and the top of the receptacle are folded together-along at least two fold lines generally parallel with the top of the receptacle forming Aat least double fold and held in the double-folded configuration.

3,491,522 Patented Jan. Z7, 1970 lCC Unfortunately, the making of bags such as disclosed in that application requires close control of the amount of adhesive applied to the bags at their junction. The seal must be extra strong and tight because at the double fold a direct stream of air impinges against the bag. This Stream of air in some cases can be strong enough t0 break the adhesive band joining the tubular portion with receptacle particularly if suicient adhesive Was applied during bag manufacture. Thus, if the seal were not in the direct path of the air stream less adhesive would be needed to seal a bag so that the seal would not be ruptured by entering air. Furthermore, such a bag could be manufactured more readily under less stringent quality control checks.

SUMMARY OF THE INVENTION Objects of the invention It is an object of this invention, therefore, to provide a vacuum cleaner filter bag particularly useful in upright type vacuum cleaners in which the adhesive bag seal is not directly in the path of the air stream.

It is another object of this invention, therefore, to provide such a vacuum cleaner `filter bag in which the adhesive bag seal is not readily ruptured.

It is a further object of this invention, therefore, to provide such a vacuum cleaner filter bag in which the deposited dirt is positioned in the bag in such a Way that it cannot readily become redispersed in the atmosphere when the bag is removed from the vacuum cleaner.

These and other objects and advantages will become apparent from the following more complete description,

accompanying drawings `and appended claim.

STATEMENT OF THE INVENTION This invention resides in an improvement in a vacuum cleaner filter bag comprising in combination a receptacle and a connecting tube, said receptacle being formed of a single sheet of air pervious paper folded substantially in half along a fold line and adhesively joined along mating edges extending from said fold line to define a receptacle structure having a bottom defined by a pair of juxtaposed edges of said sheet opposite said fold line, a pair of faces having sides defined by Said joined edges and a seamless top defined by said fold line, said receptacle being pleated to provide a plurality of knife pleats adjacent each of said sides, each of said knife pleats extending up one face of the receptacle, over said top, and down the opposed face of said receptacle, one of said faces being perforated to define an aperture therein, said connecting tube being an elongated air irnpervious paper tube having an opening at its upper end adapted to embrace a vacuum cleaner discharge fitting, said connecting tube being perforated to define an aperture registering with said receptacle aperture, said connecting tube being joined to said receptacle by a layer of adhesive interposed between said connecting tube and said receptacle and surrounding the registered apertures. The improvement resides in that said aperture of said receptacle and said aperture of said connecting tube are positioned at the top of said receptacle proximate said fold line and the bottom end of said receptacle is adhesively sealed by a single fold disposed opposite and away from said fold line and said apertures.

BRIEF DESCRIPTION OF THE DRAWINGS The invention can be more readily understood and appreciated when reference is made to the accompanying drawings, in which:

FIGURE l is a front view of the receptacle portion of 3 the vacuum cleaner filter bag of this invention stippled for adhesive;

FIGURE 2 is a front View of the connecting tube portion of the vacuum cleaner lter bag pursuant to the invention. It is also stippled for adhesive;

IFIGURE 3 is sectional elevation taken along line 3--3 of FIGURE l;

FIGURE 4 is a sectional elevation taken along line 4-4 of FIGURE 2;

FIGURE 5 is a front view of the constructed bag with the apertures shown in Adotted lines;

FIGURE 6 is a side view of an unexpanded vacuum cleaner filter bag pursuant to the present invention; and

FIGURE 7 is a sectional view taken the along line 7 7 of FIGURE 5. FIGURE 7 is partially broken away and the bag is expanded.

DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the invention is illustrated in the .accompanying drawing in iwhich the bag is generally designated 2 and comprises a receptacle portion 10 comprising elongated sheet of porous filter paper which has been folded substantially in half along a fold line 12 which forms the top 17 of the receptacle. Adjacent edges of the folded blank extending upwardly from the fold line 12 are united by beads of adhesive 14 to close the sides of the receptacle.

The receptacle is also provided adjacent each side thereof, with a plurality of knife-pleats 16. Pleats 16 can be formed after the blank is folded along line 12 and cemented along its sides, but ordinarily and preferably are formed -in the blank at an earlier stage o-f operation, so that the blank is already pleated when it is folded over on fold line 12 and face pleats 18 are cemented together. in preferred method of manufacture, .adhesive beads 14 and pleats 16 are formed continuously in the course of passage of a continuous length of porous paper through an automatic bag-making machine, and the continuous length is subsequently cut into lengths corresponding to individual bags. In the same machine -or an immediately following machine, the individual lengths may be folded over along fold line 12, and the tface pleats 18 cemented together by means of adhesive beads 14, as will also be apparent to those skilled in art.

Each of the folded blanks has one face which is perforated to provide an aperture 20 which can be cut in the blank after it is cut and folded. The aperture 20 is located proximate the fold line 12 and away from the bottom end of the bag which is adhesively sealed in a bag fold 36. In most cases it is preferred to perforate the paper stock at appropriate intervals along its length, before it is pleated, folded and cemented together at the sides. In either case, the aperture must be located as shown and described above as its position on the bag body is critical. It is decidedly nearer the top of the bag at the fold line 12 than the bottom fold 36 and is preferably spaced as close thereto as possible. Since the connecting tube is normally aixed to the receptacle 10 by adhesive 30 on receptacle 10 and adhesive 32 on connecting tube 34, the aperture 20 on receptacle 10 is positioned slightly below fold line 12 to allow for adhesive 30a between aperture 20 and foi-d line 12A. Connecting tube 34 has adhesive 32a in facing position to adhesive 30a to permit a tight seal between connecting tube 34 and receptacle 10.

Connecting tube 34 itself is of bag-type construction but is made of air impervious paper. It is sealed into a fold 38 at its upper extremity toward fold line 12 by virtue of a plurality of transverse stripes 40 and 42 of adhesive, preferably iiwater-resistant adhesive. Connecting tube 34 has sideV pleats 44 and 46 on either side thereof and a vertical seam 481 where the bag body sides are adhesively joined. Connecting tube 34 is provided with an aperture 50 of substantially the same size as aperture 20 of receptacle 10. Connecting tube 34 is suitably made on a continuous apparatus operating on a continuous length of paper perforated at intervals to provide apertures 50. The continuous length of paper is cut so as to provide an outside bag wall length having an overlapping upper end 52 and a short lower end 54. The end 54 is about 1/2 inch short from meeting end `56 of the inside bag wall 58 and the upper end'52 extends 1/2 inch over upper edge 60 of inside bag wall 58 as shown. The continuous length of paper is folded and cemented along marginal edges, as indicated at 48, to form a tube. In the same operation, or subsequently, the connecting tube is provided with adhesive in the form of the aforementioned transverse stripes 40 and 42 and the upper connecting tube end is folded over to form end fold 38.

The bag is assembled by placing the connecting tube over the receptacle in such a way that the apertures 20 and 50 are in registry and both are as close to fold line 12 as possible giving consideration to the manner in which they are joined and the nature of any adhesive employed. When so assembled, they are held together by adhesives 30, 30a, 32 and 32a, as indicated in FIGURES 1 and 2. The finished bag is shown in lFIGURE 5. At some time during the bag manufacture, the fold 36 on recptacle 10 is made in much the same manner as end fold 38 on connecting tube 34.

In use, the bag is preferably rst distended by manually spreading the lower portion of the receptacle, i.e., the portion proximate end fold 28 and then inserting it into the protective outer bag, and then connecting the lower end of the connecting tube 34 to the vacuum cleaner discharge fitting. In accordance with conventional practice, a spring-clamp, elastic ring or the like (not shown) can be used to ensure a close t of the lower end of connecting tube 34 around the end of the discharge fitting. Alternatively, the step of manually distending the lower end of the receptacle can be omitted, as the internal air pressure provided rby the vacuum cleaner blower will in most cases, serve to distend the receptacle in much the same manner.

The provision in the filter bag of this invention of the apertures in facing relationship with the fold line enables the bag to be used under greater air pressures and the like since the incoming air stream does not directly impinge against a structnrally weaker portion of the bag such as an adhesive juction. Instead, it directly irnpnges against a solid continuous bag portion which is integral with the two main receptacle bag walls. Furthermore, the specific construction more readily permits air escape from the bag interior by providing an air pervious bag member proximate -to air entry apertures. This enables the vacuum itself to operate more efliciently since the total area of the bag surface is more efficiently utilized in facilitating air exit.

Additionally, it should be pointed out that the bag itself is not readily ruptured due to incoming air puncturing the adhesive seals. This has been obivated by positioning the seals remote from the apertures so that they never are struck with an incoming stream of air at high pressure.

-I claim:

1. A vacuum cleaner filter bag comprising in combination a receptacle and a connecting tube, said connecting tube comprising an outside bag wall and an inside bag wall, 4said receptacle being formed of a single sheet of air pervious paper folded substantially in half lalong a fold line and adhesively joined along mating edges extending from said fold line to dene a receptacle structure having a bottom defined by a pair of juxtaposed edges of said sheet opposite said fold line, a pair of faces having sides dened by said joined edges and a seamless top defined by said fold `tine, said receptacle being pleated to provide a plurality of knife pleats which occupy a substantial portion of the bag width and which are adjacent each of said sides, each of said knife pleats extending up one face of the receptacle, over said top at said fold line, and down the face of said receptacle which is opposite to said one face, one of said faces being perforated to define an elongated slot aperture therein, said c011- necting tube being an elongated air impervious paper tube wherein said outside bag wall and said inside bag wall are disposed opposite to one another, and are connected together 4by pleated end walls land having an opening at its lower end adapted to embrace a vacuum cleaner discharge tting, said opening being such that the upper end of the outside bag wall of said connecting tube overlaps the upper end of the inside bag wall of said connecting tube and the inside bag Wall extends further along said receptacle than said outside bag wall by about 1/2 inch, said connecting tube inside wall being perforated to define an elongated slot aperture registering with said elongated slot aperture of the recptacle, the aperture of said receptacle being later than the aperture of said con- .necting tube, said connecting tube being joined to said receptacle by a layer of adhesive interposed between said connecting tube and said receptacle and surrounding the registering apertures, ysaid aperture of said receptacle and said apertures of said connecting tube positioned closer to said top of said receptacle than said bottom of said receptacle and proximate said fold line, the lower end of said receptacle adhesively sealed by a double fold disposed opposite and away from said fold line and said apertures, said connecting tube itself being in the form of a bag havingr its upper end closed and sealed by a single adhesive fold at its top proximate to said fold line of said receptacle and having a seam which is adhesively sealed along the entire length of said outside bag Wall from the bottom to the top of said outside bag wall, the lower end of said connecting tube terminating a substantial distance above said lower end of said receptacle.

References Cited UNITED STATES PATENTS 680,368 8/ 1901 Shattuck 229-65 X 775,268 11/ 1904 Flowers 229-61 2,577,863 12/ 1951 Sosnowich 55-376 2,672,213 3/ 1954 Cropley 229-53 X 2,710,072 6/1955 Brace 55-368 X '2,722,285 11/1955 Brace 55-368 l2,751,041 6/1956 Cropley 55-368 2,903,947 9/ 1959 Weisshuhn 93-35 2,961,063 11/1960 Pesco 229-61 X 2,995,205 8/1961 Cordell 55-381 2,995,206 8/1961 Smithson 55-376 3,197,118 7/ 1965 Meyerhoefer 229-62.5 3,297,233 1/ 1967 Meyerhoefer 229-53 3,350,859 11/1967 Fesco 55-381 FOREIGN PATENTS 643,591 8/1962 IItaly.

HARRY B. THORNTON, Primary Examiner JD. E. TALBERT, JR., Assistant Examiner U.S. Cl. X.R. 

